NSUF 19-1648: In-Situ SEM Irradiation Enhanced Creep Studies of 14 YWT
The development of in-situ SEM heated instrumented tensile and compression instruments has greatly increase the ability to perform macroscale testing in vacuum, which inhibits the oxidation of the samples and removes other environmental concerns. Combining the mechanical testing instrument with the I3SEM with in-situ SEM ion beam irradiation capability gives the ability for a wide range of experiments to be performed. Being able to perform the creep tests in-situ on an SEM would allow for the ability to observe the deformation during the test. Observing the deformation in real time would provide more information about the test and the overall deformation of the 14 YWT. The team has bulk pieces of 14 YWT located at Los Alamos National Laboratory which will have the dog bones machined out of it. After the dog bones are machined out they will be polished on both sides to a thickness of ~60 µm. The technical contact at the Sandia National Laboratory stated that 4.5 MeV protons could be used for the in-situ irradiation. A calculation in SRIM shows that 4.5 MeV protons should travel ~76 µm with the Bragg peak being at ~71 µm. The thickness chosen of ~60 µm would prevent the Bragg peak from being in the sample and would greatly reduce the beam heating of the sample and provide a more homogenize dose profile in the sample. In addition, the majority of the H+ would not be implanted in the testing sample. In addition to the testing with the irradiation, 2 unirradiated specimens will be performed at temperature in-situ in the SEM to give a baseline to compare with the samples tested while irradiated. An additional 4 specimens would be tested with 2 specimens being tested at one dose rate and the other 2 specimens being tested at different dose rate. The individual test that would be performed on a sample is a creep jump test. The same stresses and hold periods would be performed on each sample. This testing schedule would allow for the comparison of irradiation and dose rate on the irradiation enhanced creep properties of 14 YWT. The tested samples will then be brought back to LANL where additional microstructural investigations would be performed.This proposal seeks to measure the irradiation enhanced creep properties of 14 YWT at the temperature of 500 ºC in situ using the I3SEM at Sandia National Laboratory. The results of this work would be the creep rates at different irradiation rates which contributes to Generation IV Nuclear Energy Systems Initiative and provide input for modeling efforts of these advanced materials.
Additional Info
| Field | Value |
|---|---|
| Abstract | The development of in-situ SEM heated instrumented tensile and compression instruments has greatly increase the ability to perform macroscale testing in vacuum, which inhibits the oxidation of the samples and removes other environmental concerns. Combining the mechanical testing instrument with the I3SEM with in-situ SEM ion beam irradiation capability gives the ability for a wide range of experiments to be performed. Being able to perform the creep tests in-situ on an SEM would allow for the ability to observe the deformation during the test. Observing the deformation in real time would provide more information about the test and the overall deformation of the 14 YWT. The team has bulk pieces of 14 YWT located at Los Alamos National Laboratory which will have the dog bones machined out of it. After the dog bones are machined out they will be polished on both sides to a thickness of ~60 µm. The technical contact at the Sandia National Laboratory stated that 4.5 MeV protons could be used for the in-situ irradiation. A calculation in SRIM shows that 4.5 MeV protons should travel ~76 µm with the Bragg peak being at ~71 µm. The thickness chosen of ~60 µm would prevent the Bragg peak from being in the sample and would greatly reduce the beam heating of the sample and provide a more homogenize dose profile in the sample. In addition, the majority of the H+ would not be implanted in the testing sample. In addition to the testing with the irradiation, 2 unirradiated specimens will be performed at temperature in-situ in the SEM to give a baseline to compare with the samples tested while irradiated. An additional 4 specimens would be tested with 2 specimens being tested at one dose rate and the other 2 specimens being tested at different dose rate. The individual test that would be performed on a sample is a creep jump test. The same stresses and hold periods would be performed on each sample. This testing schedule would allow for the comparison of irradiation and dose rate on the irradiation enhanced creep properties of 14 YWT. The tested samples will then be brought back to LANL where additional microstructural investigations would be performed.This proposal seeks to measure the irradiation enhanced creep properties of 14 YWT at the temperature of 500 ºC in situ using the I3SEM at Sandia National Laboratory. The results of this work would be the creep rates at different irradiation rates which contributes to Generation IV Nuclear Energy Systems Initiative and provide input for modeling efforts of these advanced materials. |
| Award Announced Date | 2019-02-08T00:00:00 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Michael Starr |
| Irradiation Facility | None |
| PI | David Frazer |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 1648 |